Body, hollow and solid made of paper-pulp, wood-pulp, or the like with metal reenforcing



NOV. 10, 1931. (1 you ROTTENBURG 1,831,050

BODY, HOLLOW ANDISOLID MADE OF PAPER PULP, woon PULP, OR THE LIKE WITH METAL REENFORGING Filed Sept. 11, 1929 Patented Nov. 10, 1931 UNITED STATES PATENT OFFICE OTTO VON ROTTENBURG, 0F BERLIN-DAHLEM, GERMANY BODY, HOLLOW AINID SOLID MADE OF PAPER-PULP, WOODPULIP, OR THE LIKE WITH METAL REENFORCING Application filed September 11, 1929; Serial No. 391,953, and in Germany August 25, 1927.

This invention relates to bodies of all kinds made of paper-pulp, wood-pulp, pasteboard, papier-mach, or other fibrous material of the like kind with a metal reenforcing embedded therein.

According to the invention the reenforcing consists of a metal framework offering the novel features which will be described hereinafter.

In bodies of this kind the metal reenforcing hitherto consisted, if specified at all, of Wires, wire netting, metal sheets or laths, all of which reenforcings are chiefly efiicient in resisting tensile strains and only in a small measure with regard to strains tending to bend or break them. These reenforcings, therefore, can counteract forces tending to bend or break the reenforced body as a'whole and thereby increase the rigidity of the said body only in so far, as their tensile strength comes into play and acts in conjunction with the resistance to compression of the pulp in which they are embedded and the latters adhesion to the said metal reenforcings. In

a consequence, the rigidity attained is insuficient for many purposes, notably for large bodies, requiring considerable structural strength, which could otherwise with advantalge be manufactured of wood-pulp and the li e.

According to my invention an efficient reenforcement is attained by combining and uniting the metal laths, sheets or plates, embedded in the pulp in such a manner as to form a skeleton structure or framework rigid in itself and independently of the material in which it is embedded and corresponding to the general shape of thefibody so constructed and to the principal strains liable to act on the said body. 7

The chief advantages gained by this measure are the following: The forces and strains acting on the body press the pulp against the rigid framework and are there counteracted; the body as a whole has at least the strength of the rigid metal framework embedded therein; the pulp is exposed to incon-siderable strains only and need not be as highly compressed as hitherto; the pulp need not adhere to the reenforcing as firmly as hitherto, because the forces and strains acting on the body do not tend to separate the pulp from the reenforcing.

According to the aim in view, any of the familiar combinations of paper-pulp, woodpulp or other fibrous material can be employed. In many cases it will prove ad vantageous to employ perforated metal laths, plates or sheets in building up the rigid framework mentioned above. The surface of the body thus constructed can be treated by any of the familiar processes in use for such purposes.

The invention eliminates the difficulties in the way of widely extending the use of paperpulp and other fibrous material and opens up the possibility of manufacturing thus many articles for which these materials, even if reenforced according to the methods hitherto in use, did not offer sufficient strength. It can notably find application in the making of furniture of all kinds, parts and elements to be employed in house building such as doors, windows, shutters, light walls, the superstructure of vehicles such as motor-cars and railway-cars, parts of aeroplanes, boats.

The only figure of the accompanying drawing illustrates the fundamental idea of the invention and shows its operation in boat building.

It is a cross-section of a boat thus constructed. The rigid framework consists of strips of sheet metal forming the keel a the ribs a and the reenforced rim (1 They are embedded in the wood-pulp forming body of the boat.

My invention applies to all bodies formed of the materials and in the manner described above.

I claim Bodies of all kinds made of wood-pulp, paper-pulp or other fibrous material reenforced by means of metal laths, sheets or plates, comprising in bodies of the said kind a combination of the said reenforcing elements in such a manner as to form a frame- Work or structure rigid in itself independently of the material in which it is embedded and corresponding to the general shape of said bodies and to the principal strains liable to act on said bodies.

In testimony whereof I aflix my signature.

DR. OTTO VON ROTTENBURG. 

